Remove Owner param to EventFilter's ctor.

ash/wm/toplevel_window_event_filter.h

Index: ash/wm/toplevel_window_event_filter.h
===================================================================
--- ash/wm/toplevel_window_event_filter.h	(revision 119894)
+++ ash/wm/toplevel_window_event_filter.h	(working copy)
@@ -52,6 +52,8 @@
   virtual void EndMoveLoop() OVERRIDE;
 
  protected:
+  aura::Window* owner() { return owner_; }
+
   // Returns the |window_component_|. See the variable definition below for
   // more details.
   int window_component() const { return window_component_; }
@@ -106,6 +108,8 @@
                        int min_height,
                        int* delta_y) const;
 
+  aura::Window* owner_;
+
   // The mouse position in the target window when the mouse was pressed, in
   // the target window's parent's coordinates.
   gfx::Point mouse_down_offset_in_parent_;